Quoted from paulace:Does it make a connection through the L switch and the Thousands Unit Runout switch? Then it wouldn't make a connection if the 1000 score reel is at zero...that's kind of random. Were they going for some unpredictability?
That's what it looks like. During reset (A switch closed) it would get some random number of pulses from the Motor 1A switch until all of the score reels reach zero. During the game (A switch open) it gets a pulse when the L/1000 point relay fires, except when it's showing zero.
The F/00-90 relay is used mostly by the match circuit so they made it hard to predict where it is. Clever players at the time had reverse engineered some of the match unit functions and could predict what the next match would be:
Match predictor (resized).jpg
